Influence of boundary conditions on a flutter-mill
Influence of boundary conditions on a flutter-mill
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DOI：
10.1016/j.jsv.2020.115359
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发表时间：
2020-07
影响因子：
4.7
通讯作者：
A. Yamano;A. Shintani;Tomohiro Ito;C. Nakagawa;H. Ijima
中科院分区：
文献类型：
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作者：
A. Yamano;A. Shintani;Tomohiro Ito;C. Nakagawa;H. Ijima
本文报道了考虑几何非线性和尾流脱落的薄板流致振动的数值模拟。最近，一些研究提出了利用流体诱导振动的能量采集器，这被称为“颤振磨机”。先前的研究采用二维流或细长体近似的数值模型来评估能量采集器。这些模型在宽高比的应用范围上存在一定的局限性。采用绝对节点坐标有限元法和非定常涡格法建立三维模型。柔性片材的运动方程表现出Kelvin-Voigt型材料阻尼，以模拟片材与能量收集电路之间的耦合效应。在均匀流条件下，将数值模型与已有研究结果进行了比较，验证了模型的扑翼行为。我们使用经过验证的仿真模型，并研究材料阻尼，扑动行为，边界条件，和从流体中收获的能量之间的关系。此外，我们证实了一个灵活的薄板的钉扎边界条件是上级优于能量收集的夹紧边界条件。
This study reports on numerical simulations of the flow-induced vibration of a sheet by considering geometrical nonlinearity and wake shedding from the trailing edge. Recently, a few studies proposed energy harvesters using flow-induced vibration, which is termed as “flutter-mill”. Preceding studies employed numerical models that are approximated by two-dimensional flow or slender body approximation to evaluate an energy harvester. The models exhibit a limitation in the application range of the aspect ratio. We employ the three-dimensional model that is modelled by the finite element method with absolute nodal coordinate formulation and unsteady vortex lattice method. The equation of motion for a flexible sheet exhibits Kelvin–Voigt-type material damping to emulate the effect of coupling between a sheet and the energy harvesting circuit. The numerical model under the uniform flow is compared with that in a preceding study to verify the flapping behavior of the model. We use the validated simulation model and investigate the relationship between material damping, flapping behavior, boundary conditions, and energy harvested from the fluid. Furthermore, we confirm that the pinned boundary condition of a flexible sheet is superior to the clamped boundary condition for energy harvesting.